I think aggressive ambition of conquest and empire building
Anything that has volume or mass is matter.
A testable explanation that is supported or refuted is hypothesis.
The correct answer is A. Commanders encouraged their soldiers to be as brutal as possible.
The massacre of Nanking was a series of crimes against humanity committed by the Japanese army while they were occupying the city of Nanking and its surroundings in 1937. These crimes involved killings of civilians and prisoners, torture, violations, plunder, and other several atrocities. According to different estimates, the number of dead civilians rises above 300 000. This brutality was a direct result of the orders of the Japanese commanders: prince Asaka and general Matsui, among other Japanese military leaders.